I don't own a 17HMR, but I do have a couple of 22WMRs. I'm not exactly sure at the moment what the going rate for a box in my area is. But it seems like the last time I bought it 4-5 months ago I paid around 18$ for CCI Maxi Mags. I have around 350-400 rounds or so of 22WMR and I shoot them very little so those will last me many years. But with the future being so uncertain, if I needed it....I'd probably spend the 20-25$ or whatever it is to get it.
